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Resource ID

18307

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Contributed by

Frederik Wellmann

type of material

A. MS. notebook

description

Published, in part, as 1.521-544 (pp. 68-126, with only the first and last paragraphs deleted). Pages A1-A8, unpublished, are mainly a reply to a listener's note asking, "What makes a Reasoning to be sound?" The note itself (dated November 27, 1903) has been inserted opposite p. A1. Also unpublished is material on the beta part of existential graphs.